testaceous ( synonym found)
Definition of testaceous:

(adj) : pertaining to earthenware or baked clay; having a shell, especially one which is not articulated
"1658: they were burnt, or only baked in Oven or Sunne: According to the ancient way, in many bricks, tiles, pots, and testaceous works -- Sir Thomas Browne, Urne-Burial (Penguin 2005, p. 20)"
Definition of testaceous:

(adj) : pertaining to earthenware or baked clay; having a shell, especially one which is not articulated
"1658: they were burnt, or only baked in Oven or Sunne: According to the ancient way, in many bricks, tiles, pots, and testaceous works -- Sir Thomas Browne, Urne-Burial (Penguin 2005, p. 20)"
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